The 184 is equipped with sensors to
avoid obstacles, but there's no way for passengers to take over
the drone should something happen during flight. This has
raised some questions about just how safe the drone is.

But Ehang told CNN in January that the drone will have
programs that automatically land the drone in case of an
emergency and an on-the-ground command center staffed
with humans to provide back-up.

Should Ehang make it to market, it's estimated the drone will cost between
$200,000 to $300,000.